A vision calibration method for free-form surface polishing robot

Zhaojun Yang; Fei Chen; Ji Zhao; Hongwei Zhao

doi:10.1117/12.819552

31 December 2008 A vision calibration method for free-form surface polishing robot

Zhaojun Yang, Fei Chen, Ji Zhao, Hongwei Zhao

Proceedings Volume 7130, Fourth International Symposium on Precision Mechanical Measurements; 71300G (2008) https://doi.org/10.1117/12.819552
Event: Fourth International Symposium on Precision Mechanical Measurements, 2008, Anhui, China

Abstract

An improved vision calibration method based on free-form surface polishing robot was presented in this paper. Contrary to the classical non-linear photogrammetric approach, the proposed technique can correctly find the solution without the stereo calibration pattern. In this method, a more comprehensive camera model was adopted which based on the pinhole model, extended with radial distortions, decentering distortion and thin prism distortions correction. Take over twenty images of the model plane under different orientations by moving the plane and then detect the corner points in the image, and all intrinsic parameters and extrinsic parameters solving by optimization methods. Real data have been used to test the proposed method and the good results have been obtained. In the process of calibration, calibration precision is improved by freely moving the planar pattern in the space. The excellent performance of the proposed technique, such as convergence, accuracy and robustness, was demonstrated.

Citation Download Citation

Zhaojun Yang, Fei Chen, Ji Zhao, and Hongwei Zhao "A vision calibration method for free-form surface polishing robot", Proc. SPIE 7130, Fourth International Symposium on Precision Mechanical Measurements, 71300G (31 December 2008); https://doi.org/10.1117/12.819552

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KEYWORDS

Calibration

Cameras

Imaging systems

Polishing

Prisms

Visual process modeling

Surface finishing

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